Polarized telegraphic relay



(No Model.)

W. B. HARVEY.

POLARIZED TELEGRAPHIO RELAY.

No. 308,610. Patented Dec. 2, 1884.

ATTORNEYS.

WITNESSES: INVENTOR I WWW UNITED STATES PATENT O EIcE.

VIET B. HARVEY, OF MEMPHIS, TENNESSEE.

POLARIZED TELEGRAPHIG RELAY.

SPECIFICATION forming part of Letters Patent No. 308,610, dated December2, 1884.

Arnlication filed January 24, 1884.

The invention consists in the combination,

with a swinging armature, having one end held between the two poles of amagnet, of a coil held opposite the other end of the armature, whichcoil is provided with a core, part of which is screw-threaded,orhas ascrew-threaded piece attached,whereby by turning the said core and thecoil thereon the coil can be ad justed a greater or less distance fromthe end of the armature.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 is a plan view of mypolarized telegraph-relay. Fig. 2 is a planview of amodification of the coil.

The coil A,of the usualconstruction, is provided with a core, B,whichhas one end screwthreaded and providedwitha milled head, 0, thescrew-threaded part being passed into a threaded aperture in thestandard D. If desired, two coils can be mounted on the core B, as shownin Fig. 2, or the coil can contain two different circuits, upon whichtwo currents or branches of currents can circulate in oppositedirections in case the coil is to be used for a differentialelectro-magnet. A soft-iron armature, E, is pivoted at E, and its freeend is held between the ends of the coreF of the electro-magnetG, whichis excited by a battery, H, or the electro-magnet-G can be replaced by apermanent magnet.

Adjoining the pivoted armature E two setscrews, J and J, areheldinsuitablestandards connected by wires a and b, respectively,with

(No model.)

contact-buttons c and d, between which the pivoted switch f is located,which is connected by a wire, 9, with one end of the sounder-coil K,the other end of which sounder-coil is connected by a wire, h, with alocal battery, L, which local battery is connected by a wire, Z, withthe armature E. By means of the screwsv J and J the oscillation of thearmature can be adjusted. The coil A is connected with the main-linewire and the ground. It the circuit passes through the wire in the coilA, the core 13 will be excited, and the armature E will be swung toeither the positive or negative pole of the core F of the magnet G,according as to whether apositive or negative current is flowing throughthe coil A; and if the switch-lever f is on the button 0 the circuitwill be closed through the screw J, the wire a, the button 0, theswitch-lever f, the wire the sounder magnet K, the wire 71, the localbattery L, and the wire l, until a current of the opposite polarityismade topass through the coil A,which is accomplished in the usual way atdistant stations, it being understood that the armature E is so adjustedby the screws J J in regard to the magnet F that the armature willremain against either the screw J or J when placed there and no currentpasses through the coil A. If the eli'ect of the main current on thearmature is to be increased, the cor-e13 is turned by means of the head0 in such a manner that the end of the core 13 will be carried by thescrew-th read on the said core nearer to the end of the armature E; andif the effect of the main currentis to be decreased, the core 13 is tobe turned in such a manner as to with draw its end from the end of thearmature E. I am thus enabled to adjust the effects of the main currentwithout requiring any adj ustment or change of the poles of the core Fof the magnet G,or the permanentmagnet, which always remain in the sameposition.

By means of the switch-key the signals from a distant station can bereversed on sounder K by merely changing it from contact 0 to contact d,which is now usually accomplished by changing the wires running into thepolarized relay. The armature E, of soft iron, is not in connection withany pole of a permanent or electro magnet, and, as it has no coil tocarry,

it can swing readily and freely, and be constructed as light as isdesirable.

Having thus described my invention, I cl aim as new and desire to secureby Letters Patent- 1. The combination, with a swinging armature havingits free end held between the two poles of amagnet, of an electro-magnetadjoining the pivoted end of said armature, and connected with theline-wire, and adapted to be moved a greater or less distance from thepivoted end of said armature, substantially as herein shown anddescribed.

2. The combination, with a swinging arn1ature having its free end heldbetween the two poles of a magnet, of an electro-magnet near the pivotedend of said armature, and con nected with the line-wire, and having partof its core screw-threaded or being attached to a screw-threaded piecefor the purpose of moving the said coil toward or from the pivoted endof the armature, substantially as herein shown and described.

3. The combination, with the swinging armature E, havingits free endheld between the two poles of a magnet, ot' the coilA, connected withthe line-wire and placed adjacent to the pivoted end of the armature,and having a core, B, in alignment with the armature, and part of whichcore is smew-threaded, oris attached to a screw-threaded piece and heldin a standard, D, and of the head 0, on the outer end of the threadedpiece, substantially as herein shown and described.

4. In a polarized telegraph-relay, the combination,with a swingingarmature, E, having its free end held between the poles of a magnet, ofthe coil A, adjacent to the pivoted end of the armature, and connectedwith the linewire, and adapted to be adjusted a greater or less distancefrom the said pivoted end of the armature E, and of the screws J J oneither side of the armature, and connected with the opposite ends of thesonnder'coil, and with a local battery, substantially as herein shownand described.

5. In a polarized telegraph-relay, the combination, with a swingingarmature, E, having one end heldbetween the poles of a magnet,of thecoil A, adapted to be adjusted a greater or less distance from the end01' the armature E, the screws J J, the switch f, and wires forconnecting the screws with the coniact'button of said switch, a wire forconnecting the switch with the sounder-magnet, and wires for connectingthe sounder-magnet with the swinging armature E, substantially as herci11 shown and described.

WIRT B. HARVEY.

\Vitnesses:

J urns H. Mirroivn, F. I POSTON.

